The Flagline Harness is a fast, light, and comfortable harness that keeps dogs in their flow, from scrambling in the backcountry to conquering everyday obstacles. A handle and load-dispersing chest/belly panel make for easy lift-and-assist in a nimble design good for all-day wear. High adjustability and easy on/off make the Flagline secure and accessible, giving dogs a little boost and a lot of freedom when the path ahead is anything but flat.

Select Size

Measurement is around the widest part of the rib cage.

13-17 in (33-43 cm)
17-22 in (43-56 cm)
22-27 in (56-69 cm)
27-32 in (69-81 cm)
32-42 in (81-107 cm)

How To Measure

Key Features

Additional Features

  • Lightweight, easy on/off construction
  • Balanced and comfortable lifting with padded handle and load-dispersing chest/belly panel
  • Six points of adjustment for an optimal fit
  • Three leash attachment points: aluminum V-ring and two reinforced webbing loops
  • Debris-resistant liner
  • Reflective trim for visibility in low-light conditions and light loop for attaching The Beacon™

Care & Materials

  • Hand wash
  • Mild detergent
  • Air dry
  • 420 denier nylon ripstop
  • 75 denier polyester lining with heat emboss
  • Nylon webbing
  • ITW Nexus Mach buckles
  • Anodized 6061-T6 aluminum V-ring
  • Made in Vietnam

Trail Tested Promise

All of our products are rigorously field tested and we proudly guarantee against defects in materials and craftsmanship.

Great Companions

Ratings & Reviews

Customer Reviews
4.8 Based on 9 Reviews
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Sally C.
United Kingdom United Kingdom
Top drawer

The flagline has been worth the extra. My last dog (a collie-cross) had the front range for daily use and that was great; as he got older and needed a little help when out on the fells I got him the webmaster. My new collie inherited the webmaster because he's a rescue and a little flightly / nervy in these early days but the webmaster was a bit bulky. He escaped once in his first week in a panic when he got scared and the webmaster didn't survive. When I got him back, it was torn almost right through. I replaced it with the flagline because of the security of the handle and the ability to clip on in different places (He's double leaded currently in new situations!). The functionality as well as the fact it is lightweight means it's great for him in these early nervy times day to day. In the longer term, if he needs it out on our more challenging runs over the moor, I can clip him to a long line round my waist or hold onto him securely, if he's anxious about anything. Perfect for him.


Happy Trails!

Sue B.
United Kingdom United Kingdom
Flagline Harness

I bought the Flagline Harness for my 4 year old Clumber X Cocker who due her poor recall is attached to 10m line. I needed a harness that would be easy to fit to her body shape as she has a deep chest so her body shape is more rectangular in shape. I already own a cooling jacket from Ruffwear so knew she fitted into a S size. The harness is fantastic, as there are so many points where I can alter the fitting. She now wears it every time we are out walking. Due to the ability to fit it properly the harness does not move around her body and her line no longer gets trapped under her body which with other harnesses was happening. Now I have it set up for her it takes 10 secs to put on. An excellent piece of kit , well made, good colours. One thing I might add is somewhere on the harness to put an ID tag, not to dangle. I have decided to write on the sizing label her details in case she is off the line and does not return.

Sue Bourhill verified customer review of Flagline™ HarnessSue Bourhill verified customer review of Flagline™ Harness

Thank you Sue!

A Ruffwear Customer
Kate G.
United Kingdom United Kingdom
Excellent quality, poor sizing

I ended up getting this harness in both small and medium. Every single item of Ruffwear product (and any other brand for that matter) that I have for my dog is size small so I ordered a small in this. Great fit around the neck, had to have the first straps (behind front legs) at full length to fasten it, the 2nd straps (to fit around the belly) would not even remotely fasten, even at full length. I switched to a medium and the harness was so long that it rubbed against the back legs and the neck opening, even at its tightest, was too big. It’s such a shame that there is nothing between the two sizes… or, just longer straps on the small would be good. It seems odd that the sizing on this would not match the other products. That being said, the product looks good quality, and if I could get the size to fit then I most definitely would buy it as it looks fabulous on!

David G.
United Kingdom United Kingdom
Flagline Harness

Buying this was a no brainer. I bought my first Ruffwear harness (a Webmaster) around 8 years ago and it gets worn everyday by my Border Collie. The harness has never let me down or needed any repairs and still comes up looking like new on the rare occasions I wash it. When I needed a harness for my new dog, the Flagline seemed like the only choice.

David Grzeskowiak verified customer review of Flagline™ Harness

Thank you!

Christine B.
United Kingdom United Kingdom
Brilliant light kit.

Superb. Works well. Doesn’t impede dog movement.


Happy Trails!